Docs cleanup (#15174)

* Deleted extra pages + removed changelogs from the navigation bar

* fixed broken link

Author: Amruta-Ranade

docs/archive/examples/postgres-replication.md

@@ -30,7 +30,7 @@ You should see an onboarding page. Enter your email and continue.
 
 ## 2. Set up your first connection
 
-We support a growing [list of source connectors](../../integrations/sources). For now, we will start out with a Postgres source and destination.
+We support a growing [list of source connectors](../../category/sources). For now, we will start out with a Postgres source and destination.
 
 **If you don't have a readily available Postgres database to sync, here are some quick instructions:**  
 Run the following commands in a new terminal window to start backgrounded source and destination databases:

docs/integrations/sources/README.md

@@ -300,15 +300,6 @@ module.exports = {
           href: 'https://app.harvestr.io/roadmap/view/pQU6gdCyc/airbyte-roadmap',
         },
         'project-overview/product-release-stages',
-        {
-          type: 'category',
-          label: 'Changelog',
-          items: [
-            'project-overview/changelog/README',
-            'project-overview/changelog/platform',
-            'project-overview/changelog/connectors',
-          ]
-        },
         'project-overview/slack-code-of-conduct',
         'project-overview/security',
         {